Apart from exporting the whole Masterplan of your project, you can also export the first two weeks of your Lookahead easily from Lean PlanDo. Here's how you do it:

The export function can be found at the top right corner of Masterplan or Lookahead window.

Click on the Export, and choose the 2 weeks (... - ...) under Lookahead (with tasks) option. Format will be .xlsx by default (Microsoft Excel format).

Once you click Export, an excel file with .xlsx format will be downloaded to your device and available for use.